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Converts boxes to the normalized coordinates.

boxes a tensor whose last dimension is 4 representing the coordinates of boxes in ymin, xmin, ymax, xmax order.
image_shape a list of two integers, a two-element vector or a tensor such that all but the last dimensions are broadcastable to boxes. The last dimension is 2, which represents [height, width].

normalized_boxes a tensor whose shape is the same as boxes representing the normalized boxes.

ValueError If the last dimension of boxes is not 4.